Where: Prince Georges County, Maryland (38.9° N, 76.9° W: paleocoordinates 39.7° N, 52.8° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Severn Formation, Early/Lower Maastrichtian (70.6 - 66.0 Ma)
• group of beds-level stratigraphic resolution
Environment/lithology: marginal marine; lithified, silty, sandy lignite
Size classes: macrofossils, mesofossils, microfossils
Preservation: mold/impression, concretion, permineralized
Collected by E. Hartstein & L. Decina
Primary reference: E. F. Hartstein and L. E. Decina. 1986. A new Severn formation (Early Middle Maastrichtian, Late Cretaceous) locality in Prince Georges County, Maryland. The Mosasaur 3:87-95 [M. Uhen/M. Shalap]more details
Purpose of describing collection: general faunal/floral analysis
PaleoDB collection 125950: authorized by Mark Uhen, entered by Margaret Shalap on 27.03.2012, edited by Matthew Carrano
Creative Commons license: CC BY (attribution)
Taxonomic list
Anthozoa | |
Micrabacia marylandica Stephenson 1916 stony coral | |
Cephalopoda | |
Eutrephoceras dekayi Morton 1834 nautiloid | |
"Sphenodiscus lenticularis" = Sphenodiscus lobatus
"Sphenodiscus lenticularis" = Sphenodiscus lobatus Tuomey 1856 ammonite | |
Discoscaphites abyssinius ammonite
Discoscaphites conradi Morton 1834 ammonite | |
Baculites sp. Lamarck 1799 ammonite | |
Gastropoda | |
Weeksia peplanata snail | |
Lupira sp. Stephenson 1941 snail | |
"Turritella bilira" = Haustator bilira
"Turritella bilira" = Haustator bilira Stephenson 1941 turret shell | |
Remera flexicostata Sohl 1964 snail | |
Deussenia ripleyana Harbison 1945 snail | |
Fusimilis kummeli Sohl 1964 turrid
Beretra speciosa Sohl 1964 turrid | |
Napulus sp. Stephenson 1941 snail | |
Liopeplum coronatum Sohl 1964 volute
Liopeplum canalis Conrad 1858 volute
Liopeplum cretaceum Conrad 1858 volute | |
"Xenophora leprosa" = Xenophora (Endoptygma) leprosa
"Xenophora leprosa" = Xenophora (Endoptygma) leprosa Morton 1834 carrier shell | |
Euspira reetilabrum, Gyrodes subcarinatus, "Gyrodes spillmani" = Gyrodes (Sohlella) spillmani, Gyrodes supraplicatus
Euspira reetilabrum moon snail
Gyrodes subcarinatus moon snail
"Gyrodes spillmani" = Gyrodes (Sohlella) spillmani Gabb 1861 moon snail
Gyrodes supraplicatus Conrad 1858 moon snail | |
"Ringicula pulchella" = Ringicula (Ringicula) pulchella
"Ringicula pulchella" = Ringicula (Ringicula) pulchella Shumard 1861 snail | |
Ellipsoscapha mortoni Forbes 1845 snail | |
Bivalvia | |
Anomia ornata Gabb 1876 jingle
Anomia argentaria Morton 1833 jingle | |
Agerostrea mesenterica Morton 1834 oyster | |
"Exogyra costata" = Exogyra (Exogyra) costata
"Exogyra costata" = Exogyra (Exogyra) costata Say 1820 oyster | |
Cuneolus pectrosa mussel
Cuneolus tippana Conrad 1858 mussel | |
Liopistha prolexta clam | |
Veniella conradi Morton 1833 clam | |
Legumen planulatum venus clam | |
Cymbophora appressa clam
Cymbophora berryi Gardner 1916 clam | |
Granocardium eufalense cockle | |
Leptosolen biplicata Conrad 1858 clam | |
"Panope decisa" = Panopea, "Glycimeris mortoni" = Glycymeris
"Panope decisa" = Panopea clam
"Glycimeris mortoni" = Glycymeris clam | |
Crassatella vadosa, "Crassatella pteropsis" = Bathytormus pteropsis
Crassatella vadosa Morton 1834 clam
"Crassatella pteropsis" = Bathytormus pteropsis Conrad 1860 clam | |
"Trigonia eufaulensis" = Pterotrigonia (Scabrotrigonia) eufaulensis
"Trigonia eufaulensis" = Pterotrigonia (Scabrotrigonia) eufaulensis Gabb 1860 clam | |
Nucula slackiana nut clam | |
Nuculana rostratruncata Gardner 1916 pointed nut clam | |
Polychaeta | |
Malacostraca | |
Protocallianassa mortoni Rathbun 1935 decapod | |
Chondrichthyes | |
Myliobatis sp. Cuvier 1816 eagle ray | |
Squatina hassei Leriche 1929 angel shark | |
Ischyrhiza mira Leidy 1856 ray | |
Nebrius sp. Rüppell 1837 nurse shark | |
Hypotodus sp. Jaekel 1895 sand tiger shark | |
"Cretolamna cf. serrata" = Serratolamna serrata
"Cretolamna cf. serrata" = Serratolamna serrata Agassiz 1838 mackerel shark | |
"Cretolamna appendiculata" = Cretalamna appendiculata
"Cretolamna appendiculata" = Cretalamna appendiculata Agassiz 1835 mackerel shark | |
Reptilia | |
cf. Cimoliasaurus sp. Leidy 1851 elasmosaur NJSM 12505 (cast of specimen in private coll. of L. Decina)
| |
Actinopteri | |
Anomoeodus phaseolus Hay 1899 | |
Stephanodus sp. Zittel 1883 |